America's Next Top Model One of the models has a fear of clowns in this new episode. 9 p.m. KTLA

Luther Detective John Luther (Idris Alba) must clear his name after being accused of crimes he didn't commit while working to stop a vigilante killer in the conclusion of four-episode season. 10 p.m. BBC America

Strike Back Section 20 attempts a high-risk rescue for a possible new ally in this new episode. Rhona Mitra, Philip Winchester and Sullivan Stapleton also star. 10 p.m. Cinemax

20/20 Investigative journalism series returns for a new season. 10 p.m. ABC

John Oliver's New York Stand-Up Show Comics Ali Wong;,Travon Free and Paul. F. Tompkins are featured in this new episode. 11 p.m. Comedy Central

SPECIALS

Teach This new special from Davis Guggenheim offers a teacher's-eye view of the U.S. education system, following four teachers through the 2012-13 school year. 8 p.m. CBS

MOVIES

Dear Dumb Diary A middle-school girl's innermost thoughts, feelings and fantasies come to life in elaborate song-and-dance numbers as she sets them down in her diary. Laura Bell Bundy, Emily Alyn Lind, Mary-Charles Jones, David Mazouz, Sterling Griffith and James Waterston star in this new TV movie based on a children's book series. 8 p.m. Hallmark